3.3.6.1
Static Pressure Test:
a)
Release the tensioner by exhausting the air
pressure from the cylinder.
Ensure that the machinery will
remain in a safe position prior
to releasing the brake.
b)
Bleed all air from within the coolant cavity. Air
bleeding must be accomplished by running
coolant through the cavity with the tensioner
secured in its proper operating position.
Note: Avoid contaminating the friction material
with coolant or water.
Contamination of the friction material
could result in erratic or loss of torque.
c)
After the air has been removed, install a pipe
plug(s) in the outlet(s) and apply maximum
allowable coolant pressure measured at the
inlet to the water cavity. Maximum allowable
is 40 PSIG (2.7 bar) for size 36" and 48" units,
and 45 PSIG (3.0 bar) for all other sizes.
Maintain this pressure for 30 minutes. Check
for leakage at O.D. and I.D. sealing areas.
3.3.6.2
Dynamic Flow Test:
a)
Dynamic flow testing of the tensioner should be
conducted at the required flow rate for the rated
HP dissipation and coolant quality, as given in
Table 6. Inlet and outlet pressures for the
appropriate tensioner size as listed in Table 7
should not to be exceeded.
b)
There should be no restrictions on the outlet
side of the brake to cause any back pressure to
the unit. Coolant inlet and outlet sizes are listed
in Table 6. Full size hoses and piping should be
used. Check for low flow and/or leakage at the
O.D. and I.D. seal areas.
4.0
MAINTENANCE
Before performing any maintenance
work on the WCB2 tensioner,
make sure that the machinery will
remain in a safe position. Failure to
do so could result in serious injury or
possibly death.
Only qualified maintenance personnel
should install, adjust or repair the WCB2
units. Faulty workmanship will
result in unreasonable exposure
to hazardous conditions or
personal injury.
Read these instructions thoroughly
and review until you fully understand
the parts replacement steps before
proceeding with the work described in
this section. Failure to follow these
instructions can result in unreason-
able exposure to hazardous
conditions or personal injury.
4.1
Wear Limits
Periodically examine the tensioner for
wear of friction linings and wear plates.
Failure to perform this examination
periodically may result in excessive
wear to components, improper
operation or a significant reduction in
torque, and may result in personal
injury and/or damage to the machinery.
4.1.1
Wear limits for the WCB2 components are
shown in Table 13. If any wear limit has been
reached or exceeded, that component must be
repaired or replaced.
4.2 Wear
Adjustment
If a wear adjustment is not made when
required, the brake torque may deterio-
rate to the point where the equipment
will not stop properly.
4.2.1
Determining Wear
The friction material must be replaced when
worn to the bottom of the groove of the friction
lining - as shown on Figure 6 (or O.D. "step"
for size 48") - or any "Y" or "Z" dimension
exceeds the limits shown on Table 10. On
multi-disc units, a wear adjustment is required
when the "X" dimension has been reached
and the friction discs or "Y" or "Z"
dimension(s) are NOT worn to their limits.
WCB 11070 VP 4.2 Format
14
© Copyright Eaton Corp., 2003. All rights reserved
April 2002 (Revised June 2003)
